/*  
  -- The Lime II Project -- 

  A tuplespaces-based middleware for coordinating agents and mobile hosts.
  Copyright (C) 2005.
  Gian Pietro Picco, Amy L. Murphy, Lorenzo Bellini.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received this copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
*/

package lime2;
import java.io.Serializable;
import java.net.InetAddress;

/**
 * The superclass for the IDs of Lime items: reactions and tuples.
 *
 * @author Gian Pietro Picco
 * @author Amy Murphy
 * @author Lorenzo Bellini
 */

abstract class LimeItemID implements HashID, Serializable
{
 // private member variables
 private LimeServerID creationHost = null;
 private long n                    = -1;
 
 /**
  * Constructor method.
  * 
  * @param creationHost the host (LimeServer) on which this item was created 
  * @param n unique numeric identifier (.. must be unique only on the creationHost)
  */
 LimeItemID(LimeServerID creationHost, long n)
 {
  this.creationHost = creationHost;
  this.n = n;
 }
 
 /**
  * Returns the creation host.
  * 
  * @return creation host
  */
 public LimeServerID getCreationHost()
 {
  return creationHost;	
 }
 
 /**
  * Returns the numeric identifier, which is unique on the creation host.
  * 
  * @return long
  */
 public long getNumericIdentifier()
 {
  return n;	
 }
 
 /**
  * Returns the hashcode.
  * 
  * @return hashcode 
  */
 public int hashCode() 
 {
  return (new Integer(creationHost.hashCode()).toString() + new Long(n).toString()).hashCode();
 }

 /**
  * Returns a concise textual description for this object.
  * 
  * @return String
  */
 public String toString() 
 {
  return (creationHost == null ? "null" : creationHost.toString()) + ":" + n;
 }
}
